We''re seeking a Principal Commissioning Engineer (ECandI) to lead commissioning activities on complex Electrical and Control Systems within a highly regulated nuclear environment. This role is ideal for professionals with extensive site-based commissioning experience and a strong understanding of safety and compliance in a nuclear setting.What You''ll Be DoingLead a team of commissioning technicians delivering to national and project-specific standardsInput into design, construction, and commissioning stages to ensure commissionabilityDevelop and approve commissioning documentation (test plans, reports, records)Execute and verify commissioning tests in line with safety protocols and QA expectationsLiaise with multidisciplinary teams including QA, Engineering, Construction, and OperationsPlan daily commissioning activities, track progress, and manage execution risksReview vendor test documentation, witness FATs, and ensure data integrityKey Skills and ExperienceExtensive Electrical and Instrumentation / Control Systems commissioning backgroundExperience working in nuclear or highly regulated industrial environmentsFamiliarity with Siemens S7, Simocode, WinCC, Profibus, PICSUnderstanding of commissioning processes including FATs, TCA''s, FOBS/CRs, handoverKnowledge of 18th Edition IEE Wiring Regulations (for Electrical focus)Strong documentation and Quality Management System (QMS) adherenceQualificationsHNC / Level 4 Qualification (or equivalent commissioning experience)18th E